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            <h1>RETRO トレーニングデータセット</h1>
<p><a href="database.html">キーバリューデータベースから最も近い近傍を事前に取得し</a><a href="index.html"><a href="model.html">、RETRO モデルをトレーニングするためのデータセットを作成します。</a></a></p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">15</span><span></span><span class="kn">import</span> <span class="nn">json</span>
<span class="lineno">16</span><span class="kn">from</span> <span class="nn">pathlib</span> <span class="kn">import</span> <span class="n">Path</span>
<span class="lineno">17</span>
<span class="lineno">18</span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="lineno">19</span><span class="kn">import</span> <span class="nn">torch</span>
<span class="lineno">20</span><span class="kn">from</span> <span class="nn">torch.utils.data</span> <span class="kn">import</span> <span class="n">Dataset</span> <span class="k">as</span> <span class="n">PyTorchDataset</span>
<span class="lineno">21</span>
<span class="lineno">22</span><span class="kn">from</span> <span class="nn">labml</span> <span class="kn">import</span> <span class="n">lab</span><span class="p">,</span> <span class="n">monit</span>
<span class="lineno">23</span><span class="kn">from</span> <span class="nn">labml_helpers.datasets.text</span> <span class="kn">import</span> <span class="n">TextFileDataset</span><span class="p">,</span> <span class="n">TextDataset</span>
<span class="lineno">24</span><span class="kn">from</span> <span class="nn">labml_nn.transformers.retro.database</span> <span class="kn">import</span> <span class="n">RetroIndex</span></pre></div>
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    <div class='section' id='section-1'>
        <div class='docs doc-strings'>
            <div class='section-link'>
                <a href='#section-1'>#</a>
            </div>
            <h2>データセットの構築</h2>
<ul><li><code  class="highlight"><span></span><span class="n">chunk_len</span></code>
はチャンクの長さです</li>
<li><code  class="highlight"><span></span><span class="n">chunks_per_sample</span></code>
はトレーニングサンプルあたりのチャンク数です</li>
<li><code  class="highlight"><span></span><span class="n">skip_range</span></code>
2 つのサンプル間でスキップする最大文字数です。</li></ul><a href="database.html">サンプルがデータベース内のチャンクと完全に一致していないことを確認するために、サンプル間を数文字スキップしています。</a>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">27</span><span class="k">def</span> <span class="nf">build_dataset</span><span class="p">(</span><span class="n">chunk_len</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">16</span><span class="p">,</span> <span class="n">chunks_per_sample</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">32</span><span class="p">,</span> <span class="n">skip_range</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">8</span><span class="p">):</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-2'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-2'>#</a>
            </div>
            <p>テキストファイルを読み込む</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">39</span>    <span class="n">dataset</span> <span class="o">=</span> <span class="n">TextFileDataset</span><span class="p">(</span>
<span class="lineno">40</span>        <span class="n">lab</span><span class="o">.</span><span class="n">get_data_path</span><span class="p">()</span> <span class="o">/</span> <span class="s1">&#39;tiny_shakespeare.txt&#39;</span><span class="p">,</span>
<span class="lineno">41</span>        <span class="nb">list</span><span class="p">,</span>
<span class="lineno">42</span>        <span class="n">url</span><span class="o">=</span><span class="s1">&#39;https://raw.githubusercontent.com/karpathy/char-rnn/master/data/tinyshakespeare/input.txt&#39;</span><span class="p">)</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-3'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-3'>#</a>
            </div>
            <p>そのトレーニング部分</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">45</span>    <span class="n">text</span> <span class="o">=</span> <span class="n">dataset</span><span class="o">.</span><span class="n">train</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-4'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-4'>#</a>
            </div>
            <p>近傍検索用のインデックスを読み込む</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">48</span>    <span class="n">index</span> <span class="o">=</span> <span class="n">RetroIndex</span><span class="p">()</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-5'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-5'>#</a>
            </div>
            <p>入力サンプルオフセット</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">51</span>    <span class="n">sample_offsets</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-6'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-6'>#</a>
            </div>
            <p>テキスト用のカーソル</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">53</span>    <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="lineno">54</span>    <span class="k">while</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">):</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-7'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-7'>#</a>
            </div>
            <p>数文字飛ばして、隣の文字と揃わないようにしてください</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">56</span>        <span class="n">skip</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="n">skip_range</span><span class="p">)</span>
<span class="lineno">57</span>        <span class="n">i</span> <span class="o">+=</span> <span class="n">skip</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-8'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-8'>#</a>
            </div>
            <p>テキストの終わりに達したら止めてください</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">60</span>        <span class="k">if</span> <span class="n">i</span> <span class="o">+</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span> <span class="o">&gt;</span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">):</span>
<span class="lineno">61</span>            <span class="k">break</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-9'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-9'>#</a>
            </div>
            <p>オフセットの収集</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">64</span>        <span class="n">sample_offsets</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">i</span><span class="p">)</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-10'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-10'>#</a>
            </div>
            <p>カーソルをインクリメントしてください</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">67</span>        <span class="n">i</span> <span class="o">+=</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-11'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-11'>#</a>
            </div>
            <p>サンプル用</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">70</span>    <span class="n">samples</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-12'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-12'>#</a>
            </div>
            <p>サンプルオフセットを反復処理</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">72</span>    <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">monit</span><span class="o">.</span><span class="n">iterate</span><span class="p">(</span><span class="s1">&#39;Gather Neighbors&#39;</span><span class="p">,</span> <span class="n">sample_offsets</span><span class="p">):</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-13'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-13'>#</a>
            </div>
            <p>追加文字を含むサンプルを取得 (予測用)</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">74</span>        <span class="n">sample</span> <span class="o">=</span> <span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">+</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-14'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-14'>#</a>
            </div>
            <p>インプット</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">76</span>        <span class="n">src</span> <span class="o">=</span> <span class="n">sample</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-15'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-15'>#</a>
            </div>
            <p>それをチャンクに分割してください</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">78</span>        <span class="n">chunks</span> <span class="o">=</span> <span class="p">[</span><span class="n">src</span><span class="p">[</span><span class="n">j</span><span class="p">:</span><span class="n">j</span> <span class="o">+</span> <span class="n">chunk_len</span><span class="p">]</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">src</span><span class="p">),</span> <span class="n">chunk_len</span><span class="p">)]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-16'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-16'>#</a>
            </div>
            <p>チャンクオフセット</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">80</span>        <span class="n">chunk_offsets</span> <span class="o">=</span> <span class="p">[</span><span class="n">j</span> <span class="o">+</span> <span class="n">i</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">src</span><span class="p">),</span> <span class="n">chunk_len</span><span class="p">)]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-17'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-17'>#</a>
            </div>
            <p>最も近い近傍を検索する</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">83</span>        <span class="n">neighbor_offsets</span> <span class="o">=</span> <span class="n">index</span><span class="p">(</span><span class="n">chunks</span><span class="p">,</span> <span class="n">chunk_offsets</span><span class="p">)</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-18'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-18'>#</a>
            </div>
            <p>近所の人のテキストを取得.近傍の長さは 2 倍です</p>。<code  class="highlight"><span></span><span class="n">chunk_len</span></code>


        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">86</span>        <span class="n">neighbors</span> <span class="o">=</span> <span class="p">[[</span><span class="n">text</span><span class="p">[</span><span class="n">j</span><span class="p">:</span> <span class="n">j</span> <span class="o">+</span> <span class="n">chunk_len</span> <span class="o">*</span> <span class="mi">2</span><span class="p">]</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="n">n_off</span><span class="p">]</span> <span class="k">for</span> <span class="n">n_off</span> <span class="ow">in</span> <span class="n">neighbor_offsets</span><span class="p">]</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-19'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-19'>#</a>
            </div>
            <p>サンプルリストに追加</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">89</span>        <span class="n">samples</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sample</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">sample</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="n">neighbors</span><span class="p">))</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-20'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-20'>#</a>
            </div>
            <p>サンプルを JSON で保存します。データセットは小さいため、複雑なデータセットの保存メカニズムを使用したり、事前にトークン化したりする必要はありません</p>。

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">94</span>    <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">lab</span><span class="o">.</span><span class="n">get_data_path</span><span class="p">()</span> <span class="o">/</span> <span class="s1">&#39;retro_train_dataset.json&#39;</span><span class="p">),</span> <span class="s1">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="lineno">95</span>        <span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">samples</span><span class="p">))</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-21'>
        <div class='docs doc-strings'>
            <div class='section-link'>
                <a href='#section-21'>#</a>
            </div>
            <h2>データセット</h2>
<p>これは、によって作成されたデータセットをロードする PyTorch データセットです。<code  class="highlight"><span></span><span class="n">build_dataset</span></code>
</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">98</span><span class="k">class</span> <span class="nc">Dataset</span><span class="p">(</span><span class="n">PyTorchDataset</span><span class="p">):</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-22'>
        <div class='docs doc-strings'>
            <div class='section-link'>
                <a href='#section-22'>#</a>
            </div>
            <ul><li><code  class="highlight"><span></span><span class="n">file_path</span></code>
保存された JSON ファイルのパスです</li>
</ul><li><code  class="highlight"><span></span><span class="n">tds</span></code>
は <code  class="highlight"><span></span><span class="n">TextDataset</span></code>
</li>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">105</span>    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_path</span><span class="p">:</span> <span class="n">Path</span><span class="p">,</span> <span class="n">tds</span><span class="p">:</span> <span class="n">TextDataset</span><span class="p">):</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-23'>
        <div class='docs'>
            <div class='section-link'>
                <a href='#section-23'>#</a>
            </div>
            
        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">111</span>        <span class="bp">self</span><span class="o">.</span><span class="n">tds</span> <span class="o">=</span> <span class="n">tds</span></pre></div>
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    <div class='section' id='section-24'>
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            <p>サンプルを読み込む</p>

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            <div class="highlight"><pre><span class="lineno">113</span>        <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">file_path</span><span class="p">),</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="lineno">114</span>            <span class="bp">self</span><span class="o">.</span><span class="n">samples</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">())</span></pre></div>
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        <div class='docs doc-strings'>
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            <p>サンプル数</p>

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            <div class="highlight"><pre><span class="lineno">116</span>    <span class="k">def</span> <span class="fm">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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            <div class="highlight"><pre><span class="lineno">120</span>        <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">samples</span><span class="p">)</span></pre></div>
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    </div>
    <div class='section' id='section-27'>
        <div class='docs doc-strings'>
            <div class='section-link'>
                <a href='#section-27'>#</a>
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            <p>サンプルを入手</p>

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            <div class="highlight"><pre><span class="lineno">122</span>    <span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">idx</span><span class="p">:</span> <span class="nb">int</span><span class="p">):</span></pre></div>
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            <div class='section-link'>
                <a href='#section-28'>#</a>
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            <p>サンプルを入手</p>

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            <div class="highlight"><pre><span class="lineno">127</span>        <span class="n">s</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">samples</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span></pre></div>
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            <p>トークン化</p>

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            <div class="highlight"><pre><span class="lineno">129</span>        <span class="n">src</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="lineno">130</span>        <span class="n">tgt</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="lineno">131</span>        <span class="n">neighbors</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">stack</span><span class="p">([</span><span class="n">torch</span><span class="o">.</span><span class="n">stack</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">chunks</span><span class="p">])</span> <span class="k">for</span> <span class="n">chunks</span> <span class="ow">in</span> <span class="n">s</span><span class="p">[</span><span class="mi">2</span><span class="p">]])</span></pre></div>
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            <p></p>

        </div>
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            <div class="highlight"><pre><span class="lineno">133</span>        <span class="k">return</span> <span class="n">src</span><span class="p">,</span> <span class="n">tgt</span><span class="p">,</span> <span class="n">neighbors</span></pre></div>
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    <div class='section' id='section-31'>
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            <p></p>

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        <div class='code'>
            <div class="highlight"><pre><span class="lineno">136</span><span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span>
<span class="lineno">137</span>    <span class="n">build_dataset</span><span class="p">()</span></pre></div>
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